'obstinacy' definitions:

Definition of 'obstinacy'

From: WordNet
noun
The trait of being difficult to handle or overcome [syn: stubbornness, obstinacy, obstinance, mulishness]
noun
Resolute adherence to your own ideas or desires [syn: stubbornness, bullheadedness, obstinacy, obstinance, pigheadedness, self-will]

Synonyms of 'obstinacy'

From: Moby Thesaurus